Sony DSR-20MD, Service Manual

Page: 179 / 225

5-87 5-88
3-6. AUDIO SYSTEM ADJUSTMENTS
Unless spesified otherwise, set the switches as follows.
AUDIO NODE (Menu display) ..................................... Fs48k
INPUT SELECT .......................................................... VIDEO
AUDIO MONITOR ..................................................... CH-1/2
REC LEVEL L, R ......................................................... Center
Note 1: Set AUDIO MODE at the SET UP menu of the menu
screen.
Connection of Equipment
Checking method:
1) Check that the 1 kHz signal level satisfies the specified value.
2) Check that the number in the segment of the level meter (fluo-
rescent display tube) that is lit is between 8 and 12 for both the
L and R channels.
Note: 0 dBv = 1 Vrms
0 dBs = 0.775 Vrms
Checking method:
1) Check that the playback signal level satisfies the specified
value.
Fig. 5-3-33.
Pattern generator
VTR
Audio level meter
or distortion meter
600
Ω
47 k
Ω
Attenuator
Input to both L and R
channels simultaneously
VIDEO OUT
VIDEO INPUT
AUDIO OUTPUT AUDIO INPUT
600
Ω
: 270 (1-249-410-11) +330 (1-249-411-11)
47k
Ω
: 1-249-437-11
Audio
generator
2. E-E Level Check
Mode E-E (LINE 1 input)
Audio: 1 kHz –6 dBv (–3.8 dBs) Signal
Signal
Audio input terminal (Left and Right)
Video: Color bar signal
Video input terminal
Measurement point Audio output terminal (Left and Right)
Measuring Instrument Audio level meter
Specified Value –6 ± 3 dBv (–3.8 ± 3 dBs)
1. Playback Level/Indicator Check
Mode Playback
Signal Audio check reference tape
Measurement point Audio output terminal (Left and Right)
Measuring Instrument Audio level meter and frequency counter
32 kHz mode:
1 kHz signal should be output
48 kHz mode:
1 kHz signal level should be
+6 ± 2 dBv (+8.2 ± 2 dBs)
Specified Value
44.1 kHz mode EMP ON:
7.35 kHz signal level is –6 ± 1 dB
for 1 kHz signal level in 48 kHz mode
44.1 kHz mode EMP ON:
7.35 kHz signal level is 0 ± 1 dB
for 1 kHz signal level in 48 kHz mode
NS AUDIO lamp should be lit
3. Recording/Playback Check (Audio Lock Mode)
Note 1:
Check that the AUDIO MODE (menu screen) is Fs48k.
Note 2:
Send the frames using front panel button.
Checking method:
1) With no audio signal being input, record the color bar signal
for about 1 minute.
2) Playback the recorded part, and set the playback pause mode.
3) Select page: 5, address: 00 using the adjusting remote com-
mander.
4) Send the frames, so that the display data for page: 5, address:
00 is D4. (NTSC)
5) Send 5 frames continuously, and check that the display data of
page: 5, address: 00 changes in the order specified.
6) Exit the playback pause mode, playback the recorded part, and
check that the NS AUDIO lamp (front panel) is off.
Mode Recording/Playback (LINE input)
Signal Audio: no signal
Video:
Color bar Video input terminal
Measurement point
Display data of page: 5, address: 00
Measuring Instrument
of the adjusting remote commander
1 After playback pause, the changes in the
data after 5 frames have been sent
continuously must be in the following
order.
Specified Value “D4”
t
“D6”
t
“D6”
t
“D6”
t
“D6”
t “D4” (NTSC)
“D8” t “D8” t “D8” t “D8” t “D8”
t “D8” (PAL)
2 NS AUDIO lamp should be lit.
3-7. ARRANGEMENT DIAGRAM FOR ADJUSTMENT PARTS
RP-228 BOARD (SIDE A)
CN101
30 1
CN102
CN775
30 1
2 20
1 19
CN771
10 9
2
1
CL812
CL813
CL815
CL816
CN12
11 1
CN11
9 1
CN10
8
1
RP-228 BOARD (SIDE B)
POWER BLOCK (U-2)